Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net Income	$ 235	$ 158
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	259	232
Deferred income taxes	65	58
Asset (gains), losses and reserves and impairments, net	(6)	(19)
Changes in assets and liabilities, exclusive of changes shown separately (Note 15)	44	191
Net cash from operating activities	597	620
Investing Activities
Plant and equipment expenditures — utility	(309)	(331)
Plant and equipment expenditures — non-utility	(73)	(61)
Proceeds from sale of assets	4	11
Restricted cash for debt redemption, principally Securitization	57	63
Proceeds from sale of nuclear decommissioning trust fund assets	12	11
Investment in nuclear decommissioning trust funds	(16)	(15)
Other	(7)	(21)
Net cash used for investing activities	(332)	(343)
Financing Activities
Issuance of long-term debt, net	372	0
Redemption of long-term debt	(141)	(86)
Short-term borrowings, net	(240)	(106)
Issuance of common stock	10	10
Dividends on common stock	(107)	(99)
Other	(6)	(7)
Net cash used for financing activities	(112)	(288)
Net Increase (Decrease) in Cash and Cash Equivalents	153	(11)
Cash and Cash Equivalents at Beginning of Period	65
Cash and Cash Equivalents at End of Period	$ 218	$ 57